+1, this seems like it could be very useful. A somewhat related issue
is being able to tie plan nodes back to the query text: it can be hard
to understand the planner's decisions if it's not even clear what part
of the query it's making decisions about. I'm sure this is not an easy
problem in general, but I wonder if you think that could be improved
in the course of this work, or if you have other thoughts about it.
Thanks,
Maciek